Since some days I can't compile Mesa git due to the following error:

 CC       common/common_libamd_common_la-ac_gpu_info.lo
In file included from common/ac_gpu_info.c:26:0:
common/ac_gpu_info.h:31:20: fatal error: amdgpu.h: No such file or directory
compilation terminated.
make[4]: *** [Makefile:936: common/common_libamd_common_la-ac_gpu_info.lo] Error 1
make[4]: Leaving directory 'mesa-git/src/amd'
make[3]: *** [Makefile:738: all] Error 2
make[3]: Leaving directory 'mesa-git/src/amd'
make[2]: *** [Makefile:850: all-recursive] Error 1
make[2]: Leaving directory 'mesa-git/src'
make[1]: *** [Makefile:641: all] Error 2
make[1]: Leaving directory 'mesa-git/src'
make: *** [Makefile:641: all-recursive] Error 1

Build was working fine some 2 weeks ago.

This is strange as I do not want to compile AMDGPU driver, I am compiling r600 (for a rv710 card). I have selected these drivers:
--with-dri-drivers="" --with-gallium-drivers="r600,swrast"

Even if compiling r600 needed amdgpu.h, I do have that in /usr/include/libdrm/amdgpu.h . So it may be just the including does not work right.